Paul D Ryan rode to power two years ago like a hero on a white horse, a reluctant candidate for House speaker elected to heal wounds left by his predecessor, who could not tame the incessant infighting between hard-line conservatives and establishment Republicans.
In one of his first real tests, Mr. Ryan discovered last week that those old wounds can reopen fast. But in President Trump, his mercurial partner in the White House, the speaker deftly found a foil to deflect some of the anger that had felled the man he succeeded, John A. Boehner.
President Trump’s fiscal deal with Democratic leaders

